The 1888 Liberty Head Nickel has a mintage similar to that of the 1912-D, and both coins are valued similarly across the grade spectrum. Only eight other dates in the series have a lower mintage (nine, if you count the 1913 Liberty Nickel), making it one of the more popular, early dates.
The most common Mint State grade for the 1888 Nickel is MS-64, followed by MS-63. Gems are scarce and superb exmples are essentially non-existent. The finest 1888 Nickel certified by PCGS (as of December 2011) is a single MS-66+.
Collectors should seek spot-free examples that show a strong strike, especially on the obverse stars and the ear of corn on the lower left reverse.